Update Statistics <> Auto UPDATE STATISTICS option

  • 1> When i say Auto create statistics, what are the columns for which statistics are collected? Are these all columns part of the primary key or just the index statistics?

    2> What is the difference between index statistics and column statistics?

    3> Do i need to explicitly create statistics for columns which are not part of primary key but are used in queries?

    4> Who are candidates for column statistics?

    5> If i explicitly create statistics on some columns, is updating them my resposibility or its taken care of by auto update statistics?

    6> Which system table stores statistics information?

  • Please - don't cross post. they all get read....

    Answered by gilaMonster over here:

    http://www.sqlservercentral.com/Forums/Topic446867-65-1.aspx

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    Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?

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